21312021301213 has 4 divisors (see below), whose sum is σ = 21313502654400. Its totient is φ = 21310539948028.

The previous prime is 21312021301177. The next prime is 21312021301271. The reversal of 21312021301213 is 31210312021312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21312021301213 - 2³⁷ = 21174582347741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312021304213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740655013 + ... + 740683786.

It is an arithmetic number, because the mean of its divisors is an integer number (5328375663600).

Almost surely, 2^{21312021301213} is an apocalyptic number.

It is an amenable number.

21312021301213 is a deficient number, since it is larger than the sum of its proper divisors (1481353187).

21312021301213 is a wasteful number, since it uses less digits than its factorization.

21312021301213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481353186.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21312021301213 its reverse (31210312021312), we get a palindrome (52522333322525).

The spelling of 21312021301213 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred one thousand, two hundred thirteen".